# DeckTools Whiteboard

> Free, production-ready, interactive digital whiteboard engineered for educators, tutors, engineering teams, and visual thinkers. Built with Rough.js handwriting, 30+ precision drawing tools, real-time collaboration with teacher moderation, password-protected virtual classrooms, and offline-first IndexedDB persistence.

## Website & Web App
- Domain: https://whiteboard.decktools.app
- Canonical URL: https://whiteboard.decktools.app/
- Live Classroom Joining: https://whiteboard.decktools.app/?room=[ROOM_CODE]

## Core Capabilities
- **Hand-Drawn Excalidraw-Style Ink**: Uses Rough.js for organic hand-drawn handwriting, sketches, shapes, and arrows without double-lines or jitter.
- **30+ Independent Tools**:
  - Ink & Pens: Pencil (Handwriting), Pen (Smooth Ink), Felt Marker, Translucent Highlighter, Artistic Brush.
  - Erasers: Precision sub-path stroke eraser, whole-object eraser.
  - Geometric Shapes: Rectangle, Rounded Rectangle, Ellipse/Circle, Triangle, Polygon (multi-point & freeform), Star, Heart.
  - Connectors & Lines: Straight Line, Single Arrow, Double Arrow, Smooth Quadratic Curve, Smart Snap Connector.
  - Rich Content: Typography Text Box with cursor drag resizing, Sticky Notes, LaTeX Math Equation rendering, Data Grid Tables, Image insertion with cropping.
  - Interactive Teaching Widgets: Mindmap nodes with auto-branching, Laser pointer with fading trail, Dynamic Ruler guide, 360-degree Protractor, Compass geometry tool, Teaching stopwatch/countdown timers.
- **Real-Time Collaboration**:
  - Room security: Password protection for all virtual rooms.
  - Room capacity: 15 concurrent live participants.
  - Teacher Moderation: Waiting room with manual admission or one-click Auto-Admit. Student drawings queue for teacher review before publishing to the class.
  - Zero-refresh instant sync: Sub-second polling (400ms) with per-tab client ID isolation.
- **Data Persistence**:
  - Ephemeral 24h scratchpads with automatic garbage collection.
  - Permanent Lesson mode with unlimited cloud/local storage.
  - Version history with automated snapshot capture.
  - Import/Export: JSON (.deckboard), SVG, PNG, CSV, and PDF.

## Additional Documentation for LLMs
- [Comprehensive LLM Reference](https://whiteboard.decktools.app/llms-full.txt): Detailed breakdown of APIs, database schemas, tool registry, and keyboard shortcuts.
- [Sitemap](https://whiteboard.decktools.app/sitemap.xml): Machine-readable index of site URLs.